I just bought a new MAC Pro this weekend. It came with an GeForce 7300 GT. However I am having a hard time finding the 7600 for purchase. In fact I called Apple and asked for it. However they do not sell it as a separate purchase.

First off where can I find one?

Second can you buy one at any PC Store? In other words are the cards different from PC to MAC.

Thirdly does anyone have the 7600 GT in their MAC Pro?

This locked in hardware is really getting to me. That is where a PC just excels, I can upgrade anything...